[Very RFC 25/46] powernv/pci: Remove pdn from pnv_pci_config_check_eeh()

[Alexey Kardashevskiy]

On 20/11/2019 12:28, Oliver O'Halloran wrote:
> Despite the name this function is generic PowerNV PCI code rather than anything
> EEH specific. Convert to take a phb and bdfn rather than a pci_dn.
> 
> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
> ---
>  arch/powerpc/platforms/powernv/pci.c | 32 ++++++++++++++++++----------
>  1 file changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
> index 6170677bfdc7..50142ff045ac 100644
> --- a/arch/powerpc/platforms/powernv/pci.c
> +++ b/arch/powerpc/platforms/powernv/pci.c
> @@ -591,9 +591,15 @@ static void pnv_pci_handle_eeh_config(struct pnv_phb *phb, u32 pe_no)
>  	spin_unlock_irqrestore(&phb->lock, flags);
>  }
>  
> -static void pnv_pci_config_check_eeh(struct pci_dn *pdn)
> +/*
> + * This, very strangely named, function checks if a config access
> + * caused an EEH and un-freezes the PE if it did. This is mainly
> + * for the !CONFIG_EEH case where nothing is going to un-freeze
> + * it for us.
> + */

Rather than writing a comment like this, simply rename it to
pnv_pci_cfg_check_and_unfreeze() or similar as you are changing
callsites anyway. Thanks,



> +static void pnv_pci_config_check_eeh(struct pnv_phb *phb, u16 bdfn)


>  {
> -	struct pnv_phb *phb = pdn->phb->private_data;
> +	struct pnv_ioda_pe *ioda_pe;
>  	u8	fstate = 0;
>  	__be16	pcierr = 0;
>  	unsigned int pe_no;
> @@ -604,10 +610,11 @@ static void pnv_pci_config_check_eeh(struct pci_dn *pdn)
>  	 * setup that yet. So all ER errors should be mapped to
>  	 * reserved PE.
>  	 */
> -	pe_no = pdn->pe_number;
> -	if (pe_no == IODA_INVALID_PE) {
> +	ioda_pe = __pnv_ioda_get_pe(phb, bdfn);
> +	if (ioda_pe)
> +		pe_no = ioda_pe->pe_number;
> +	else
>  		pe_no = phb->ioda.reserved_pe_idx;
> -	}
>  
>  	/*
>  	 * Fetch frozen state. If the PHB support compound PE,
> @@ -629,7 +636,7 @@ static void pnv_pci_config_check_eeh(struct pci_dn *pdn)
>  	}
>  
>  	pr_devel(" -> EEH check, bdfn=%04x PE#%x fstate=%x\n",
> -		 (pdn->busno << 8) | (pdn->devfn), pe_no, fstate);
> +		 bdfn, pe_no, fstate);
>  
>  	/* Clear the frozen state if applicable */
>  	if (fstate == OPAL_EEH_STOPPED_MMIO_FREEZE ||
> @@ -642,6 +649,7 @@ static void pnv_pci_config_check_eeh(struct pci_dn *pdn)
>  		if (phb->freeze_pe)
>  			phb->freeze_pe(phb, pe_no);
>  
> +		/* fish out the EEH log and send an EEH event. */
>  		pnv_pci_handle_eeh_config(phb, pe_no);
>  	}
>  }
> @@ -735,7 +743,8 @@ static int pnv_pci_read_config(struct pci_bus *bus,
>  			       int where, int size, u32 *val)
>  {
>  	struct pci_dn *pdn;
> -	struct pnv_phb *phb;
> +	struct pnv_phb *phb = pci_bus_to_pnvhb(bus);
> +	u16 bdfn = bus->number << 8 | devfn;
>  	struct eeh_dev *edev;
>  	int ret;
>  
> @@ -755,7 +764,7 @@ static int pnv_pci_read_config(struct pci_bus *bus,
>  		    eeh_dev_check_failure(edev))
>                          return PCIBIOS_DEVICE_NOT_FOUND;
>  	} else {
> -		pnv_pci_config_check_eeh(pdn);
> +		pnv_pci_config_check_eeh(phb, bdfn);
>  	}
>  
>  	return ret;
> @@ -766,7 +775,8 @@ static int pnv_pci_write_config(struct pci_bus *bus,
>  				int where, int size, u32 val)
>  {
>  	struct pci_dn *pdn;
> -	struct pnv_phb *phb;
> +	struct pnv_phb *phb = pci_bus_to_pnvhb(bus);
> +	u16 bdfn = bus->number << 8 | devfn;
>  	struct eeh_dev *edev;
>  	int ret;
>  
> @@ -779,9 +789,9 @@ static int pnv_pci_write_config(struct pci_bus *bus,
>  		return PCIBIOS_DEVICE_NOT_FOUND;
>  
>  	ret = pnv_pci_cfg_write(pdn, where, size, val);
> -	phb = pdn->phb->private_data;
> +
>  	if (!(phb->flags & PNV_PHB_FLAG_EEH))
> -		pnv_pci_config_check_eeh(pdn);
> +		pnv_pci_config_check_eeh(phb, bdfn);
>  
>  	return ret;
>  }
> 

-- 
Alexey